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I have been tasked with taking a fairly old robot vehicle and upgrading as many systems as possible. It has an array of 7 sonar sensors that I would like to re-use, but I don't have a good working knowledge of what to do with them. They have only two wires. I sort of know the idea behind how they'll work (send a pulse to the sensor, flip a switch somewhere in the wiring(?), get the return signal, figure out time between the ping and the return) but that's where I'm at. What I would love is something like an example circuit of how to hook this thing up and I can then try to program some tests on a Raspberry Pi or some other cheap device.

What about the circuit it originally had? You're very correct to ask about it. It appears to have used a TI TL851CN chip to control the sonar. I read the data sheet and it wasn't very illuminating to someone of my experience level (student). Second, the data sheet says it is meant to be paired with a TL852 chip which is nowhere to be found on the original circuit. So, I'm not really able to figure out what it's doing.

user2867890
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  • Have a look here: [How to Wire Up Ultrasonic Transducer](http://electronics.stackexchange.com/questions/93458/how-to-wire-up-ultrasonic-transducer) – Tut Feb 05 '14 at 20:24
  • That is very useful, but not quite similar enough to be usable I think. The transducers on the vehicle are not in pairs; one unit must send and also receive. The circuits shown there are a send circuit/transducer and a receive circuit/transducer. Still very good for my own learning, but I won't be able to use it. – user2867890 Feb 05 '14 at 22:03

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Maybe this device is a better option. It appears to have transmitter and receiver built in together: -

enter image description here

Details can be found here

Andy aka
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